That happened in a church I went to once.
Apparently the grape juice had been in the fridge a little too long.
All the deaconesses set up communion, no one the wiser, until it was time to drink.
On first sip, there was a kind of collective pause, everyone looked at their cup, looked at their neighbor, and started giggling.
Never happened again but I'll bet they were really careful about using fresh grape juice after that.
I'll bet all those little old ladies were just mortified.
What a hilarious story! Thanks for sharing it. I felt like I was right there as it happened. Priceless.